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PETG Filament is known as Polyethylene Terephthalate and is a very tough and hard 3D Filament.Other than Nylon Filaments, PETG Stands on it own as being the most robust filament for FDM 3D Printers. It is also known to be a plastic used in most cola bottles and has hard but also flexible properties. This makes it great for mechanical parts and clips that need a bit of flex.PETG Filament can be difficult to print with for beginners but luckily not as tricky as ABS Filament.PETG doesnt require a heated but putting some heat on the bed will certainly help.